MonGoDb simple additions and deletions to search

One: Start the database service
1:cmd Enter the bin directory of the database installation directory
2:MONGPD--dbpath Database data storage directory
Example: Mongod--dbpath E:\NODE\MonGoDB
database Data storage directory for any existing directory

Two: Connect a database service that has started
1:cmd into the bin directory of the database installation directory (the window opened in the first step cannot be closed and stopped)
2:mongo Database access address: Port
Example: MONGO 127.0.0.1:27017
The local access address is 127.0.0.1 or localhost
The default port is 27017

Three: Common commands
1:show DBS, see all databases that have been created
2:use Database name--switch or create a database
3:db.dropdatabase (); Delete current database
4:db.getname (); Get the name of the current database
5:db.getmongo (); Get the connection address of the current database
7:show cellections, getting all collections of the current database (table)
8:db. Collection name. Save (JSON), add data to the collection (table), the nonexistent collection is automatically created
9:db. Collection name. Update (Json1, json2), modifying data
Json1 for query criteria such as {"id": +}
Json2 to modify as {"name": "Test"}
modifies the name field of all data with ID 25 to "test"
10:db. Collection name. Remove (JSON), delete data
JSON is similar to the json1 of 9 for conditions that need to be removed
11:db. Query data with name. FIND (JSON)
JSON is similar to 9 json1, for conditions that require querying

Four: code example

Let mongoclient = require ("MonGoDB"). Mongoclient;let URL= "Mongodb://localhost:27017/admin"; mongoclient.connect (URL,function(err, db) {if(Err) {Console.log ("Database connection Failed!"); } Else{insertone (db); }});functionInsertone (db) {db.collection ("User"). Insertone ({"Name": "Test",        "Sex": 1    }, function(err, result) {Console.log (Result.result);    Console.log (Result.ops) db.close (); });}

Let mongoclient = require ("MonGoDB"). Mongoclient;let ObjectId= Require ("MonGoDB"). Objectid;let URL= "Mongodb://localhost:27017/admin"; Mongoclient.connect (URL,function(err, db) {if(Err) {Console.log ("Database connection Failed!"); } Else{deleteData (db); }});functionDeleteData (db) {db.collection ("User"). Deleteone ({_id:NewObjectId ("59ba30b2d5f3741b9831bea8")    }, function(err, result) {Console.log (Result.result);    Db.close (); });}

Let mongoclient = require ("MonGoDB"). Mongoclient;let URL= "Mongodb://localhost:27017/admin"; mongoclient.connect (URL,function(err, db) {if(Err) {Console.log ("Database connection Failed!"); } Else{uodatedata (db); }});functionUodatedata (db) {varcursor = db.collection ("User"). Updatemany ({"Name": "Zhang San"    }, {        "$set": {            "Name": "Chen Hui",            "Sex": 1        }    }, function(err, result) {Console.log (Result.result); });}

Let mongoclient = require ("MonGoDB"). Mongoclient;let ObjectId= Require ("MonGoDB"). Objectid;let URL= "Mongodb://localhost:27017/admin"; mongoclient.connect (URL,function(err, db) {if(Err) {Console.log ("Database connection Failed!"); } Else{selectall (db); }});functionSelectAll (db) {//Exact Search    //var cursor = db.collection ("User"). Find ({_id:new ObjectId ("59ba30970692cd172083a836")});    //Search All    varcursor = db.collection ("User"). find (); varresult = []; Cursor.each (function(err, doc) {if(doc = =NULL) {Console.log (result);        Db.close (); } Else{Result.push (doc); }    })}

MonGoDb simple additions and deletions to search